Improvement in circulating-grates for steam-generators



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JAMES BRADLN, OF INDIANAPOLIS, INDIANA, ADMINISTRATOR OF THE ESTATE OF JAMES SOANLAN, DECEASED. V 1

Letters Patent N 96,354, dated November 2, 1869.

IMPROVEMBNT IN CIRQULATING--GRATES FORiSTEAM-G-ENERA'TORS.

The Schedule referred to in these Letters Patent and making part ofthe same.

' nation ot' a feeding-pum p, feedingpipes, tubular gratebars, a waste-pipe, at'ceding-pipe, andasteam-generator or m rrd-dr'urngin such a manner that said pump shall be capable ot' fcedin g the water tothe generator or muddrurn, through such trrbular grates, and, at the same time, permit a portion of the water to be discharged through a cock-or valve, for the purpose of carrying otl' the sediment contained therein, so as to prevent its being deposited in said generator'.

The second part of the invention relates tothe combin-ation ofa reservoir with the feed-pipes, tubular water-grates, and waste-pipe, in such a rnauner,'that when the iire is burning upon the grate, and the pump is not in operation, water may be passed through the grates, and thus any injury be prevented which otherwise urigirt result from the overheating of said grate-bars.

Thethird part of the invention relates to the combination of a waste-cock or valve in the waste-pipe,

with a series of tubular grate-bars, the object being to.

provide a means for the discharge of any earthy matter which may have been precipitated from the water during its passage'throngh the grates, in consequence of the heat imparted to it therein, and thus prevent its passage to the generator' or the ruud-drum connected therewith.

The accompanying drawing is a perspective view of so rnrrclr of a steam generator and its appendages as is necessary to illustrate the combination ot' the improve nrents therewith,

A, in the drawings, represents the walls of the arch or surroundings ot' the generator', which may be of brick, stone, iron, or any other suitable material.

A' represents the chamber or tlue in rear of the grates, and leading to the rear end of the generator.

B B represent-the tubular grates, which consist ot' a series of pipes, placed parallel to each other', and at suitable distances apart, toY admit of the passage of air for the support ot' cornbnstiorr, and of the passage of thc ashes, resulting i'rorn the burning ot the fuel thereon. 'llre ends ot' the pipes, of which the grate is iu part composed, are held in position, and have their distances from cach other regulated by cast-iron connections, consisting ot' halt' turns, their' ends being provided with -ernale-screw threads for the reception ot' rrrale screws upon the ends ot' the pipes or tubes. 'lhese halt' turns have an aperture thror'rgh them for the passage ot' the water, and thus a continuons pas-v sage is formed from the irrdnction-pipe on one side to the eduction-pipe upon the other, through which the water passes from they pump-to 'the generator. The fact that there isa constant current of water pass-V ing through the grate-bars, prevents the deposition ot any scale upon the interior surface of such bars, and, at the same time, prevents the burning away of the same, while the fact that their temperature is lower than that of solid grate-hars, eft'ectually prevents the formation of clinker' upon their outer surfaces, not withstanding the great heat to which they are subjected, the heat in this case being taken up by the water within the pipes, 'and carried to the generator', thus aiding very materially inthe generation of steam, instead of being radiatediuto the ash-pit, 'and thus lost, as in the case of the solid grate.

C represents a pipe, which may lead directly lfrom theI feed-pump to the induction-end ofthe grate-bars, or it may be connected with another pipe, with which the discharge-pipe from such pump is also connected, as shown in the drawings. In either case there should be a check-valve in this pipe, just outside of the point where the discharge-pipe ii'om the pump is joined to it, for the purpose of preventing the return ofthe water from the grate through such pipe, such an arrangement of valve being necessary to the proper working ofthe pump.

D represents a reservoir for water, which is to be placed in any convenient and elevated position, and is to he provided with a pipe, which is to enter it near' its bottom, and extend iomthence to and connect with the feed-pipe, or with such pipe as it may be connected with.

This pipe is to be provided with a cock or valve, K, so arranged, that when the pump is in operation, it may be closed, and thus communication between the reservoir and feed-pipe be cut ott", but so, that when the pump is not in operation, this cock or valve may be opened, and the cock or valve in the pump-pipe closed, and thus a communication between the reset# voir and the grates be established.

As a consequence of this arrangement, a stream of water rnay be caused to circulate through the gratos,

when the pump is .not in operation, by opening the. cock or valve M in the discharge-pipe I, and closing the cock or valve L in feed-pipe F, as shown in the drawings. l

As a consequence of the above-described combination of devices, a current may be established through the grates when steam is being raised, or after the errgine has been stopped, or at any other time, when the pump is not in operation; and thus the heat, which would otherwise destroy the grates, will be 'carried off, and, atv the same time, the deposition of sediment upon the interior surfaces of the grates willbe effectually prevented.

E represents the lower portion of the pump, or a pipe, which connects it with the feed-pipe O. This pipe is to be supplied with a cock or valve for the purpose of closing the communication `between the pump andthe feed-pipe, when the grate is being supplied with water from the reservoir. i F represents a pipe which conducts the water from the discharge-piped, after it has passed through the grates, to the mud-drum or` generator. This pipe is to be supplied with a valve or. cock for the purpose of shutting 4off. communication with the y.genera-tor, as above described.,

Gr represents a cylindrical vessel, which is termed the muil-drum. It is to be placed in the'settin'g of the generator, substantially as` shown in the drawings. I'oA the outer end of this drum, the feed-pipe F is attached; It is apparent, however, that this drum may be dispensed with, and the feed-pipe be connected directly tothe generator, as, when these combinations are used, the matter usually collected in such` drums is discharged through the pipe I, as wills'oon be de-I scribed.

H represents the pipe which connects the generator to the mud-drum, the,l generator resting at its rear end upon such v.pipe and drum.

I represents a pipe which is to be attached to the outer end of the gratefbar, orfth'at'end from which thev water escapes after it'has passed through such grate.

It is to be vsupplied with a cock orvalve, which, in practice, and when the pump is in operation, is to be left in suoli a position as to permit a portion' of the Ywater to waste at that point, and thus a large portion of the earthy matter, which would be carried forward to the generator, will be vdischarged at that point. f `lhis pipe and its valve or cock are-also to be used and described.

2. 'lhe combination of a reservoir, feed-pipe, tubular grates, and Vwaste-pipe, substantially as and for the purpose set forth.

3. The combination of a wastepipe,'liavingin ita cock or valve for permitting a portion of.' the waterto be wasted through such Valve or cock, and a` seriesof tubular grams', when the feed-Water'is passedthrough such grates previous 4to its entering the generator, substantially as and for the purpose specified.

' JAMES. BRADEN.

i Witnesses: v

F. H. SPRAGUE,

C. F.4 GLAUsnN.' 

